OpenCV 4: Basic Functions

Import Open CV and choose a picture to read in to be used later on.

import cv2 as cv

img = cv.imread('/Users/richzha/Desktop/CV/Image/Cat.jpg')
cv.imshow('Image', img)

cv.waitKey(0)

Gray Scale

# Converting to Grayscale
gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
cv.imshow('Gray', gray)

cv.waitKey(0)

Blur

# Blur
blur = cv.GaussianBlur(img, (7,7), cv.BORDER_DEFAULT)
cv.imshow('Blur', blur)

cv.waitKey(0)

Edge Cascade

# Edge Cascade
canny = cv.Canny(blur, 125, 175)
canny1 = cv.Canny(img, 125, 175)
cv.imshow('Canny Edges', canny)

cv.waitKey(0)

Dilating Image

# Dilating the image
dilated = cv.dilate(canny, (7,7), iterations=3)
cv.imshow('Dilated', dilated)

cv.waitKey(0)

Eroding Image

# Eroding
eroded = cv.erode(dilated, (7,7), iterations=3)
cv.imshow('Eroded', eroded)

cv.waitKey(0)

Resize

# Resize
resized = cv.resize(img, (500,500), interpolation=cv.INTER_CUBIC)
cv.imshow('Resized', resized)

cv.waitKey(0)

Crop

# Cropping
cropped = img[50:200, 200:400]
cv.imshow('Cropped', cropped)

cv.waitKey(0)